According to the Trump campaign, the new commercial featured footage of Cruz "in a confused state" during a Fox News interview, in which he was pressed about an amendment to an immigration-reform bill.

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Donald Trump torches Ted Cruz in new TV ad

STAFFORD-MARCH 1:
Ted Cruz holds his victory rally at the Redneck Country Club in Stafford, Texas. On the left is his wife, Heidi and their two daughters and on the right is the Lt. Governor of Texas, Dan Patrick. (Photo by Lucian Perkins /for The Washington Post via Getty Images)

Senator Ted Cruz, a Republican from Texas and 2016 presidential candidate, stands on stage during a Super Tuesday night event in Houston, Texas, U.S., on Tuesday, March 1, 2016. Cruz said Monday in Dallas that Super Tuesday will make the Republican primary a 'two-man race,' predicting that he and Donald Trump will finish far ahead of rivals Marco Rubio, John Kasich and Ben Carson in terms of delegates. Photographer: Matthew Busch/Bloomberg via Getty Images

Senator Ted Cruz, a Republican from Texas and 2016 presidential candidate, greets attendees with his wife Heidi Cruz and children during a campaign event in San Antonio, Texas, U.S., on Monday, Feb. 29, 2016. Cruz said Monday in Dallas that Super Tuesday will make the Republican primary a 'two-man race,' predicting that he and Donald Trump will finish far ahead of rivals Marco Rubio, John Kasich and Ben Carson in terms of delegates. Photographer: Matthew Busch/Bloomberg via Getty Images *** Local Captions *** Ted Cruz; Heidi Cruz

US Republican presidential hopeful Sen. Ted Cruz speaks at a presidential campaign rally in Dallas, Texas on February 29, 2016 one day before the 'Super Tuesday' primaries.
Americans in a dozen states head to the polls for a slew of primaries and caucuses March 1 on what is considered the most important day of the presidential nominations calendar. / AFP / Laura Buckman (Photo credit should read LAURA BUCKMAN/AFP/Getty Images)

UNITED STATES - FEBRUARY 27: Presidential candidate Sen. Ted Cruz, R-Texas, arrives for a campaign rally near the Georgia State Capitol Building in Atlanta, Ga., February 27, 2016. (Photo By Tom Williams/CQ Roll Call)

HOUSTON, TX - FEBRUARY 24: Republican presidential candidate U.S. Sen Ted Cruz (R-TX) greets people during a campaign rally at the Mach Industrial Group on February 24, 2016 in Houston, Texas. The process to select the next Democratic and Republican Presidential candidates continues. (Photo by Joe Raedle/Getty Images)

AMES, IA - JANUARY 30: Republican presidential candidate Sen. Ted Cruz (R-TX) arrives at a campaign event at the Gateway Hotel on January 30, 2016 in Ames, Iowa. The Democratic and Republican Iowa Caucuses, the first step in nominating a presidential candidate from each party, will take place on February 1. (Photo by Brendan Hoffman/Getty Images)

HAMLIN, IA - JANUARY 30: Republican presidential candidate Sen. Ted Cruz (R-TX) speaks at a campaign event at Darrell's Place on January 30, 2016 in Hamlin, Iowa. The Democratic and Republican Iowa Caucuses, the first step in nominating a presidential candidate from each party, will take place on February 1. (Photo by Brendan Hoffman/Getty Images)

HAMLIN, IA - JANUARY 30: Republican presidential candidate Sen. Ted Cruz (R-TX) (C) greets an audience member as he is introduced at a campaign event at Darrell's Place on January 30, 2016 in Hamlin, Iowa. The Democratic and Republican Iowa Caucuses, the first step in nominating a presidential candidate from each party, will take place on February 1. (Photo by Brendan Hoffman/Getty Images)

LAS VEGAS, NV - DECEMBER 17: Republican presidential candidate Sen. Ted Cruz (R-TX) speaks during a campaign rally at the Siena Community Center on December 17, 2015 in Las Vegas, Nevada. Two days after participating in the fifth GOP presidential debate, Cruz began a swing through eight Super Tuesday states in five days. (Photo by Ethan Miller/Getty Images)

WASHINGTON, DC - DECEMBER 03: Republican presidential candidate Sen. Ted Cruz (R-TX) leads a moment of silence for victims of the San Bernardino shooting prior to his address to the Republican Jewish Coalition at Ronald Reagan Building and International Trade Center December 3, 2015 in Washington, DC. Candidates spoke and took questions from Jewish leaders and activists. (Photo by Alex Wong/Getty Images)

Senator Ted Cruz, a Republican from Texas and 2016 presidential candidate, speaks during a Tea Party Patriots rally against the Iran nuclear deal on Capitol Hill in Washington, D.C., U.S., on Wednesday, Sept. 9, 2015. A revolt among U.S. House Republicans delayed action on the Iran nuclear deal today as some members insisted they aren't bound by a Sept. 17 deadline in their efforts to kill the agreement. Photographer: Andrew Harrer/Bloomberg via Getty Images

Senator Ted Cruz, a Republican from Texas and 2016 presidential candidate, speaks at the Iowa State Fair Soapbox in Des Moines, Iowa, U.S., on Friday, Aug. 21, 2015. A day after Jimmy Carter appeared on national television to talk about the cancer that's ravaging his body, Cruz criticized the former president's administration in a speech in Iowa. Photographer: Daniel Acker/Bloomberg via Getty Images

Senator Ted Cruz, a Republican from Texas and 2016 presidential candidate, eats a pork chop at the Iowa Pork Producers tent during the Iowa State Fair in Des Moines, Iowa, U.S., on Friday, Aug. 21, 2015. A day after Jimmy Carter appeared on national television to talk about the cancer that's ravaging his body, Cruz criticized the former president's administration in a speech in Iowa. Photographer: Daniel Acker/Bloomberg via Getty Images

Senator Ted Cruz, a Republican from Texas and 2016 presidential candidate, speaks at the Rally for Religious Liberty in Des Moines, Iowa, U.S., on Friday, Aug. 21, 2015. A day after Jimmy Carter appeared on national television to talk about the cancer that's ravaging his body, Republican presidential candidate Cruz criticized the former president's administration in a speech in Iowa. Photographer: Daniel Acker/Bloomberg via Getty Images

UNITED STATES - AUGUST 8: Presidential candidate Sen. Ted Cruz (R-TX) spends a few moments with his daughter Catherine before the start of the Cruz bus tour rally in a field behind Sprayberry's BBQ in Newnan, Ga., on Saturday, Aug. 8, 2015. (Photo By Bill Clark/CQ Roll Call)

UNITED STATES - JULY 29: Sen. Ted Cruz, R-Texas, awaits for the elevator doors to close as he arrives in the basement of the Capitol, July 29, 2015. (Photo By Al Drago/CQ Roll Call)

WASHINGTON, DC - JULY 28: Republican presidential candidate, U.S. Sen. Ted Cruz (R-TX) speaks during a Anti-abortion rally opposing federal funding for Planned Parenthood in front of the U.S. Capitol July 28, 2015 in Washington, DC. Sen. Rand Paul (R-KY) announced a Senate deal to vote on legislation to defund Planned Parenthood before the Senate goes into recess in August. (Photo by Olivier Douliery/Getty Images)

WASHINGTON, USA - JULY 23: Republican Presidential Candidate Senator Ted Cruz speaks out against the nuclear deal with Iran during a demonstration that was interrupted by counter protestors in Lafayette Park across the the street from the White House in Washington, DC on July 23, 2015. (Photo by Samuel Corum/Anadolu Agency/Getty Images)

Senator Ted Cruz, a Republican from Texas and 2016 U.S. presidential candidate, speaks during The Family Leadership Summit in Ames, Iowa, U.S., on Saturday, July 18, 2015. The sponsor, The FAMiLY LEADER, is a 'pro-family, pro-marriage, pro-life organization which champions the principle that God is the ultimate leader of the family.' Photographer: Daniel Acker/Bloomberg via Getty Images

AMES, IA - JULY 18: Republican presidential hopeful Senator Ted Cruz of Texas fields questions at The Family Leadership Summit at Stephens Auditorium on July 18, 2015 in Ames, Iowa. According to the organizers the purpose of The Family Leadership Summit is to inspire, motivate, and educate conservatives. (Photo by Scott Olson/Getty Images)

Senator Ted Cruz, a Republican from Texas and 2016 presidential candidate, stands outside while waiting to speak during the Faith and Freedom Coalition's 'Road to Majority' legislative luncheon in Washington, D.C., U.S., on Thursday, June 18, 2015. The annual Faith & Freedom Coalition Policy Conference gives top-tier presidential contenders as well as long shots a chance to compete for the large evangelical Christian base in the crowded Republican primary contest. Photographer: Andrew Harrer/Bloomberg via Getty Images

WASHINGTON, DC - JUNE 04: Sen. Ted Cruz (R-TX) participates in a Judiciary Subcommittee hearing on the Affordable Care Act on Capitol Hill June 4, 2015 in Washington, DC. The hearing is billed as 'Rewriting The Law, Examining the Process That Led to the ObamaCare Subsidy Rule'. (Photo by Mark Wilson/Getty Images)

Senator Ted Cruz, a Republican from Texas and 2016 presidential candidate, speaks during a press conference at the Hampton Inn and Suites in Seneca, South Carolina, U.S., on Wednesday, Feb. 17, 2016. Cruz says Donald Trump sent his lawyers cease and desist letters over a Cruz campaign ad that portrays Trump as pro-choice saying that if the Cruz campaign doesn't pull ad, they'll see immediate legal action to prevent the continued broadcast of this ad, according to Cruz. Photographer: Daniel Acker/Bloomberg via Getty Images

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"Ted Cruz is a total hypocrite and, until recently, a Canadian citizen who may not even have a legal right to run for president," Trump said in a statement accompanying the video. (Many legal experts dispute Trump's claim about Cruz's eligibility to be president.)

"Had I not brought up the subject of illegal immigration, an issue which Ted Cruz is very weak on, nobody would even be talking about it. I will build a great wall, and Mexico will pay for it."
Donald Trump, GOP Front-Runner

The new attack ad was only the latest salvo in an increasingly hostile back-and-forth between Trump and Cruz as the February 1 Iowa caucus approaches. On Thursday, Cruz highlighted a two-year-old Trump tweet to argue that it was Trump who supported "amnesty."